i have 72 in Heavy Armor, and i understod, that from 50 ,my stuff only half weigth,

but no, all the time it the same,

i wear this moment Umbra Ebony gear and Dwarven gear ,

Why is it full weigth?

It goes down in weight at skill level 75. 3 more skill levels to go!

Indeed!
Grab some healing potions/scrolls/spells then attract as many mudcrabs as you can. Let them eat you until you get these 3 points. A cheap but quick way to do it.

Ok ,thanks, i was sure it was at 50